Restore original httpx import behavior

Author: c0llab0rat0r

ipfshttpclient/http.py

@@ -19,14 +19,15 @@
 
 PREFER_HTTPX = (os.environ.get("PY_IPFS_HTTP_CLIENT_PREFER_HTTPX", "no").lower()
                 not in ("0", "f", "false", "n", "no"))
-#if PREFER_HTTPX:  # pragma: http-backend=httpx
-#	from . import http_httpx as _backend
-#else:  # pragma: http-backend=requests
-#	try:
-#		from . import http_requests as _backend  # type: ignore[no-redef]
-#	except ImportError:  # pragma: no cover
-#		from . import http_httpx as _backend
-
-from . import http_requests as _backend
+if PREFER_HTTPX:  # pragma: http-backend=httpx
+	try:  #PY36+
+		from . import http_httpx as _backend
+	except (ImportError, SyntaxError):  #PY35
+		from . import http_requests as _backend  # type: ignore[no-redef]
+else:  # pragma: http-backend=requests
+	try:
+		from . import http_requests as _backend  # type: ignore[no-redef]
+	except ImportError:  # pragma: no cover
+		from . import http_httpx as _backend
 
 ClientSync = _backend.ClientSync